Rock Stress Sensitivity and its Influence on Productivity of Overpressured Gas Reservoir: A Case Study in Yinggehai Basin, China
International Journal of Oil, Gas and Coal Engineering
Volume 3, Issue 3, May 2015, Pages: 33-40
Received: Apr. 30, 2015;
Accepted: May 20, 2015;
Published: Jun. 2, 2015
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Peng Xiaodong, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China; Postgraduate, petroleum engineer, engaged in reservoir engineering and reserve evaluation, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Lu Yan, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Liu Xin, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Duan Ce, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Li Zhengjian, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Liu Shijie, CNOOC Energy Technology & Services Ltd. Drilling & Production Company, Tianjin, China
Tong Luyi, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
H gas reservoir is an overpressured gas reservoir with high temperature. It is generally believed that overpressured gas reservoir exist stress sensitivity effect due to uncompaction. Firstly, this study conducted lab core test to analysis stress sensitivity of rock by defined confining pressure and decreasing inner pressure. Test results show that the reservoir processes weak to medium stress sensibility. Then, according to mineral composition analysis and strain-stress curve comparison of the cores, stress sensibility is considered to be mainly caused by low hardness clay mineral. Finally, based on well testing data of well H-X-1, we used pseudo-pressure binomial deliverability equation considering stress sensitivity to discuss the influences of stress sensibility on productivity. Results show that the stronger the stress sensibility is, the more obviously productivity decreases. As stress sensibility of the block is weak to medium, it has little impact on productivity.
Rock Stress Sensitivity and its Influence on Productivity of Overpressured Gas Reservoir: A Case Study in Yinggehai Basin, China, International Journal of Oil, Gas and Coal Engineering.
Vol. 3, No. 3,
2015, pp. 33-40.
Ostensen, R.W., “Micro crack permeability in tight gas sandstone”, SPE 10924, 1983.
Davies J.P. and Davies D.K., David K. Davies & Assocs. Inc., “Stress dependent permeability characterization and modeling”, SPE 71750, 2001.
Zhu Z.Q., Wang Z.B., Li R.Y., Zhong Q., and Wang K., “Characteristics of the rock deformation in Abnormal high-Pressure gas reservoir and the studies of its influence on gas reservoir exploitation: example from the Kela2 gas field”, Natural Gas Geoscience.
Dong P.C., Jiang T.W., and Tang M.L., “Research on stress-sensitivity in abnormal high pressure gas reservoir”, Chinese Journal of Rock Mechanics and Engineering, 2008, 27, (10), pp. 2087–2093.
Xiang Y. and Xiang D., “An experimental study of simulating high-speed production in tight sandstone gas reservoir”, Journal of Chengdu University of Technology, 2002, 29, (6), pp.617– 619.
Guo P., Zhang J., Du J.F., et al, “New way to improve gas well production condensate gas field’s recovery factor”, Journal of Southwest Petroleum University, 2007, 29, (2), pp.7–9.
Yang S.L., Xiao X.J., Wang X.Q., et al, “Stress sensitivity of rock and its influence on productivity for gas reservoirs with abnormal high pressure”, Natural Gas Industry, 2005, 25, (5), pp.94–95.
Guo J.J., Zhang L.H. and Tu Z., “Stress sensitivity and its influence on productivity in gas reservoirs with abnormally high pressure”, Special Oil & Gas Reservoir, 2010, 17, (2), pp.79–81.
Yang B., Jiang H.Q., Chen M.F., et al, “Diliverability equation for stress-sensitive gas reservoir”, Journal of Southwest Petroleum University (Science & Technology Edition), 2008, 30, (5), pp. 158–160.
Fang Y. “Research on relationship between deliverability of gas reservoir and the stress-sensitiveness of the reservoir”, Well Testing, 2009, 18, (6), pp.18–21.
Xie Y.H., Zhang Y.Z., Li X.S., et al, “Main controlling factors and formation models of natural gas reservoirs with high-temperature and overpressure in Yinggehai Basin”, Acta Petrolei Sinica, 2012, 33, (4), pp.601–609.
Pei J.X., Yu J.F., Wang L.F., et al, “Key challenges and strategies for the success of natural gas exploration in mid-deep strata of the Yinggehai Basin”, Acta Petrolei Sinica, 2011, 32, (4), pp.573–579.
Song W.J., Jiang T.W., Wang Z.B., Li R.Y., Feng J.L. and Zhu Z.Q., “Development techniques for abnormal high-pressure gas fields and condensate gas fields in Tarim Basin’, SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 18–20 October 2004.
Li B.Z., Zhu Z.Q., Xia J., Ma C.Q., “Development patterns and key techniques of coal-formed Kela 2 gas field”, Petroleum Exploration and Development, 2009, 36, (3), pp.392–397.
Muhammad A., Amanat A.B., Ahmed S.K., and Syed A.H., “An alternative approach for well test analysis and production performance in tight gas reservoirs considering stress dependent permeability”, SPE/PAPG Annual Technical Conference, Islamabad, Pakistan, 3-5 December 2012.
Sun H.D., Xiao X.J., Yang J.P. and Zhang F., “Study on productivity evaluation and performance prediction method of overpressured stress-sensitive gas reservoirs”, SPE Asia Pacific Oil & Gas Conference and Exhibition, Jakarta, Indonesia, 30 October–1 November 2007.
Li C.L, “Evaluation method for stress sensitivity of reservoir rock”, Petroleum Geology & Oilfield Development in Daqing, 2006, 25, (1), pp.40–42.
He J.G., Kang Y.L., You L.J., et al, “Effects of mineral composition and microstructure on stress-sensitivity of mudrocks”, Natural Gas Geoscience, 2012, 23, (2), pp.129–134.
Du X.L., Kang Y.L., You L.J., et al, “Controlling Factors of Stress Sensitivity in Low-Permeability Reservoirs”, Natural Gas Geoscience, 2010, 21, (2), pp.295–299.